Sökning: "clathrates"

Visar resultat 1 - 5 av 13 avhandlingar innehållade ordet clathrates.

  1. 1. Thermoelectric Ba8Ga16Ge30 clathrates for waste heat recovery

    Författare :Daniel Cederkrantz; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; thermal stability; substitution; thermal conductivity; Seebeck coefficient; electrical resistance; Clathrates; Ba8Ga16Ge30; waste heat recovery; semiconductors;

    Sammanfattning : The modern, highly industrialized, society of today requires huge amounts of energy to function. This has resulted in a heavy dependence on the very energy efficient fossil fuels, a source of energy which of course is not infinite and we are slowly approaching the day when oil runs out. LÄS MER

  3. 2. Structure and Thermoelectric Properties of Type-I Clathrates Ba8(AlxGa1−x)16Ge30

    Författare :Yifei Zhang; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Microstructure; Crystal structure; Transport properties; Thermoelectrics; Clathrates;

    Sammanfattning : Thermoelectric materials enable the direct conversion between a thermal gradient and an electrical potential gradient, and can thus be exploited for electricity generation. One of the promising thermoelectric materials is type-I clathrates. LÄS MER

  4. 3. Improving Thermoelectric Properties of Inorganic Clathrates by Atomic and Microscale Structure Engineering

    Författare :Yifei Zhang; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Crystal structure; Thermoelectrics; Chemical ordering; Microstructure; Clathrates; Thermal properties; Electrical transport properties;

    Sammanfattning : As more countries are aiming for a carbon-neutral economy, technologies that utilize renewable energies are increasingly being considered. Thermoelectric materials enable the direct conversion between a thermal gradient and an electrical potential gradient, and are thus exploited for applications such as waste heat recovery. LÄS MER

  5. 4. Thermal transport in van der Waals Solids and Inorganic Clathrates from first-principles calculations

    Författare :Daniel Lindroth; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; phonons; Boltzmann transport theory; layered compounds; thermal conductivity; van der Waals solids; clathrates; electronic structure calculations;

    Sammanfattning : Energy management is arguably one of the defining challenges for our modern societies. An ever-increasing demand for energy has to be balanced with the requirement for a sustainable energy economy that minimizes the human impact on the environment. LÄS MER

  7. 5. Atomic scale modeling of ordering phenomena in inorganic clathrates

    Författare :Mattias Ångqvist; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; ordering phenomena; Cluster expansion; Monte Carlo; Inorganic clathrates;

    Sammanfattning : Ordering phenomena in materials often have a crucial impact on materials properties. They are governed by the competition between entropy and energy. Accordingly simulating these aspects requires the construction of models that enable an computationally efficient exploration of the relevant configuration space. LÄS MER